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AssigneeSony Disc & Digital Solutions Inc.
InventorsOsamu Matsuura, Kazuhiro Miura, Hideaki Yoshimura, Shinsuke Kishi
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A resin ring 51 is press-fitted into a grove portion formed in an inner periphery surface of an interlocking ring 4. The resin ring 51 is made of a hard resin such as Teflon. The resin ring 51 as a low frictional lubricative member is interposed between the interlock ring 4 and an outer periphery ring 3. In addition, a cavity 6 as a closed space is formed between a stamper 1b as a molding surface of a fixed side mirror 1 and a mirror side molding surface 2b of a moving side mirror 2. While the moving side mirror 2 is being press-contracted to the fixed side mirror 1, when a resin material is filled into the cavity 6, the outer periphery ring 3 is slidably held in a groove of the moving side mirror 2 with predetermined clearances. In the interlock ring 4, a plurality of openings 4a which relieve gas produced by the disc resin material filled into the cavity 6 are formed.
A molding die for a disc substrate, the molding die having a fixed die member, a moving die member, and an outer periphery ring, the fixed die member being in opposition to the moving die member, the outer periphery ring being slidably disposed in an outer periphery portion of the moving die member or the fixed die member, a stamper being disposed in a cavity formed by the fixed die member, the moving die member, and the outer periphery ring, resin being injected into the cavity and solidified,
Dependencies are inferred from the claim text.